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Volume 7 Number 1 January/February 2008

With all the sunshine and warm temperatures we have in the Southwest, we have the potential for very high rates of evapotranspiration—if water is available. The question is how much ET actually occurs? ET is a difficult parameter to measure, but various methods have been developed to try to get at that upward flux of moisture. These range from direct measurement at a single point to direct measurement from space, or indirect measurement at an equally large range of scales. Who is using these methods? For what uses? What sorts of values are being measured? Our contributors address these questions and more.

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